Some herbal supplements sold in Poland might be contaminated with dangerous levels of lead and nickel — heavy metals that can harm your brain and even cause cancer — and most of the ones tested weren't safe.

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Evidence from Studies

Supporting (1)

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Community contributions welcome

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Heavy Metal Contamination in Adaptogenic Herbal Dietary Supplements: Experimental, Assessment and Regulatory Safety Perspectives

Cross-Sectional Study

2025 Oct 23

The study tested 11 adaptogen supplements sold in Poland and found most had unsafe levels of lead and nickel, just like the claim says. These metals can be harmful over time, especially if you take the supplements regularly.

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Heavy Metal Contamination in Adaptogenic Herbal Dietary Supplements: Experimental, Assessment and Regulatory Safety Perspectives

Score: 26

DOI: 10.3390/biology14111479

Similar Assertions

The adaptogenic supplements tested in Poland don’t have dangerous levels of cadmium or mercury — they’re clean and safe when it comes to these heavy metals.

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73%

Herbal supplements made from plants grown in India have way more nickel in them—more than double—compared to similar supplements made from plants grown in China, and that difference is probably not just by chance.

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72%

Schisandra supplements — whether in dried fruit or pill form — are the most contaminated adaptogens tested, with lead and nickel levels way over safety limits, making them riskier than other popular adaptogens.

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70%